Locomotive-brake



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LOOOMOTIVE BRAKE.

-N0. 433,413.v Patented July 29,1890.

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L. P. LAWRENCE. LOGOMOTIVB BRAKE.

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Patented July 29, 1890.

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Patented July 29, 1890.

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UNITED STATES PATENT ()rnicn.

LOUIS P. LAIVRENCE, OF PASSAIO, NEIV JERSEY.

LOCOMOTIVE-BRAKE.

SPECIFICATION forming part of Letters Patent No. 433,413, dated July 29,1890.

Application filed January 2, 1890,

To all whom it may concern.-

Be it known that I, LOUIS I. LAWRENCE, of Passaic, in the county ofPassaic in the State of New Jersey, have invented certain new and usefulImprovements in Locomotive-Brakes, of which the following is aspecification.

This invention relates to improvements in that class of brakesthat areto be applied between the driving-Wheels of alocomotive; and' the objectof my invention is to provide a brake in which the brake-shoes areapplied to the rims of two adjacent wheels in such a manner that thewheels are not interfered with in their lateral or vertical movementscaused by the unevenness in the track, and so that the pressure of thebrakeshoes does not act injuriously on the bearing of the axles.

The invention consists in the construction and combination of parts anddetails, as will be fully described hereinafter, and finally pointed outin the claims.

In the accompanying drawings, Figure 1 is a side view of a so-calledMogul engine provided with my improved brakes and with other locomotivebrakes that I have previously patented. Fig. 2 is a verticallongitudinal section of. my improved locomotivebrake. Fig. 3 is avertical transverse sectional View of the same on the line 3 3, Fig. 2.Fig. 4 is a vertical longitudinal sectional View of the brake as usedfor wheels that are separated a greater distance.

Similar letters of reference indicate corresponding parts.

In that class of engines known as Mogul engines, and in many others, thedrivingwheels are so located that their rims are sometimes but a fewinches apart, thus excluding the use of brakes in which a cylinder isplaced between the wheels, brakes of this kindbeing described in mypatcnt,No. 417,194, dated December 10, 1889.

In my improved brake the cylinder or cham' her A, which is madeoblong-that is to say, its length is greater than its Width-is arrangedbetween the drivingwheels at, but above the planes of the axles I). Saidcylinder contains a diaphragm B, resting against and secured to apiston-plate C, from which or running-board d of the locomotive.

Serial No. 335,564. (No model.)

the stem D projects downward, said stem having a slot D. The upperbrake-shoes F are pivoted to the cylinder or chamber A by pivots F insuch a manner as to be adjacent to the wheel-rims, and below theirpivots they rest against the heads of pins G, placed into tubular rubbercushion-springs I-I, resting in suitable sockets in the side parts ofthe cylinder or chamber A. Said cushion-springs H and pins G prevent theupper ends of the shoes from tilting downward sufficiently to rest uponthe wheel-rims when the brakes are not applied, and thus serve to holdthe brakeshoes at all times in proper position in relation to thewheel-rims.

In the cylinder or chamber A two levers J are arran gedone at eachside-the o uter ends of the levers J being pivoted by'pivots J to thecylinder or chamber, which pivots J are above and slightly to one sideof the pivots by which the brake-shoes are pivoted to the cylinder orchamber, and the inner ends of said levers J are bent to form toes Jwhich pass into the slot D of the stem D and rest,

on the bottom of said slot. To each lever J the upper end of a link K ispivoted a short distance from the turning-point or pivot J of said leverJ, the lower ends of said links K being pivoted to lugs E of a tubularpull-rod E, passing up through the bottom neck A of the cylinder orchamber A. The power part of said tubular pull-rod E is threadedinternally, and into the same the upper end of the pull-rod E isscrewed, which supports the lower brake-shoes in a manner that will bedescribed hereinafter. A packing-ring L is placed in the bottom neck ofthe cylinder or chamber A, and against the inner edge of the same thetubular pull-rod E rests, which ring serves to prevent undue rattling.

The head A of the cylinder or chamber A, between which head and thecylinder or chamher the diaphragm I is clamped securely, is provided onits top with a suitable lug M, to which a bolt N is pivoted, said boltpassing up through the bottom aperture of a boxshaped hanger O,securelybolted to the frame On the upper end of said bolt N a nut P is screwed,.having its lower end formed cup-shaped, and

between the bottom of said box and the cupshaped lower end of said nut Pa powerful spiral spring R surrounds the bolt N. The entire brake deviceis thus supported by means of the bolt N, nut P, and spring R from thebox or bracket 0.

The lower brake-shoes Q, which are arranged between the wheel-rims andbelow the planes of the axles, are pivoted to the opposite ends of ablock S, resting on a sleeve T, that is bolted or riveted to the lowerend of the rod E, and is provided at its lower end with a cross-piece orhand-wheel T. In said block S cushion-springs H are arranged,like thosedescribed above, for supporting the lowerparts of the shoes Q, and thusprevent the shoes from coming in contact with the rims of the wheelswhen the brake is not applied. A fiexible pipe V connects the head A ofthe cylinderAwith the vacuum-pipe V for the purpose of exhausting theair, said pipe V being connected with the ejector f or other-vacuumapparatus in the cab g.

The operation is as follows: When the air is exhausted from the spacebetween the piston O and the head A of the cylinder or chamber A, theexterior pressure of the air forces the piston O upward, whereby theslotted stem D is also forced upward and in turn pulls up "the free endsof the levers J. Thereby the links K are pulled upward and in turn pullup the tubular pulling-rod E and the rod E. Thereby the blockS is raisedand the shoes Q pressed against the wheel-rims, said shoes Q forming anabutment. As the free ends of the levers J can only be pulled up untilthe shoes Q rest against the rims of the wheels, it follows that thepivot-points J of the levers J within the cylinder or chamber A mustmove downward, and with them the entire chamber A moves downward,whereby the upper brake-shoes F are pressed against the wheels. By thedownward movement ofthe brake-cylinder the spring R is compressed moreor less. When the vacuum is destroyed, the piston 0 moves downward,cylinder A is moved upward, the rod E moved downward, and all thebrake-shoes are released. By turning the nut P the cylinder or chamber Amay be so adjusted as to hold the brake-shoe F the desired distance fromthe Wheel-rims, and by turning the rod E the same is screwed a greateror less distance into the tubular rod E, and thereby the lowerbrake-shoes are adjusted to be in proper position. As the cylinder A canswing on its bolt M, and as the pull-rod E is connected with thecylinder or chamber A by pivot-links and levers, it is evident that evenwhen the brake-shoes are firmly applied on the wheels said wheels canmove up and down or later-' ally without causing any undue strain on theworkin g parts of the brake, such up and down movement being caused byirregularities in the track, which are frequently quite considerable. Asthe wheels are braked at opposite sides either by the shoes of a brakesuch as the one herein described or by means of brakes m, which arefully described in my patent, No. 417,194, dated December 10, 1889,

1 distance from each 0theras shown, for example,in Fig. 1, between thefirst and second driving-wheels from the front, or in Fig. 4-theconstruction must be somewhat modified. In this case the brake-shoes 10are connected by links Z with the cylinder or chamber A, which isconstructed and hung in the manner previously described. The shoes arealso connected by links a with a bracket 0 on the 10- comotive-frame w.The pull-rod p is screwed into the downwardlyprojecting piston-stem Dand is provided at its lower end with a box D Levers r, pivoted tothelinks a, have their free ends placed into the box D and rested on thebottom of the same.

\Vhen the airis exhausted from the cylinder or chamber A, theair-pressure forces the piston upward, whereby the rod 19 and the box Dare pulled upward, and thereby the shoes are pressed against thewheel-rims and form an abutment. As now the piston cannot move upward,the chamber or cylinder A moves downward under the action of theatmospheric pressure, and thereby, by means of the links Z, assists inpressing the shoes 70 against the wheel-rims. When the va'cuum isdestroyed, the spring R pulls the cylinder or chamber upward and the rodp is moved downward.

If desired, the brake can be operated in analogous manner by compressedair, gas,

steam, or any other motive fluid.

Having thus described my invention, I claim as new and desire to secureby'Letters Patent-- 1. A brake cylinder or chamber mounted on alocomotive-frame between the wheels 'to move vertically, and a movablepiston in said cylinder or chamber, substantially as set' forth.

2. The combination, with a locomotiveframe, of a brake cylinder orchamber held by a spring hanger or support between the wheels,substantially as set forth.

3. The combination, with a locomotiveframe, of abrake cylinderor chambermounted vertically movable between the wheels,brakeshoes connected withand operated by said cylinder or chamber, and a movable piston in saidcylinder or chamber and connected with the brake-shoes, substantially asset forth.

4. The combination, with a locomotiveframe, of a cylinder or chambermounted vertically movable between two wheels, a piston in saidcylinder, and a pull-rod operated from said piston and passing downbetween the two wheels, substantially as set forth.

5. The combination, with a locomotiveframe, of a cylinder or chambermounted vertically, apiston in said cylinder, brake-shoes on thecylinder, and another set of brake-shoes IIO connected with the piston,substantially as set forth.

6. The combination, with a locomotiveframe, of a cylinder or chambermounted be tween the wheels, a piston in said cylinder or chamber andprovided with an extension or piston-rod, levers pivoted on the cylinderor chamber and engaging said piston-rod or extension, a pull-rod, linksconnecting the pull-rod with the said levers, and brake-shoes at thelower end of said pull-rod and operated by the same, substantially asset forth.

7. The combination, with a locomotiveframe, of a cylinder or chambermounted between the wheels to move vertically, a piston in said cylinderor chamber and provided with an extension or piston-rod, levers pivotedin said cylinder 01' chamber, a pull-rod which is adj ustablein lengthand connected with the said levers in the chamber, brake-shoes appliedon said cylinder or chamber, and brakeshoes' supported by the lower endof the pullrod, substantially as set forth.

8. The combination, with a locomotiveframe, of a cylinder or chambermounted between the wheels to move vertically, a piston in'said cyinderor chamber provided with an extension or piston-rod, a tubular pull-rodextending downward from the cylinder, levers pivoted on the cylinder andengaging the piston-rod, links connecting said levers with the tubularpull-rod, a rod screwed into the lower end of the tubular pull-rod,brake-shoes supported by the lower end of said rod, and brakeshoesapplied on the cylinder or chamber, substantially as set forth.

9. The combination, with .a vehicle-frame, of a cylinder or chamber, ahanger or box on the vehicle-frame, a screw-bolt pivoted to the cylinderor chamber and passed into the box, a nut on said bolt, a spring onwhich the nut rests, and brake-shoes operated from the cyl-' inder,substantially as set forth.

10. In a power-brake for vehicles,a powercylinder mounted movably on'the frame or body of the vehicle, brakeshoes operated from said chamberor cylinder, and a movable piston in said chamber or cylinder, and alsooperating brake-shoes, combined substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presv ence of two subscribing witnesses.

LOUIS P. LAVVRENOE.

Witnesses:

OSCAR F. GUNZ, THOS. M. MOORE.

